I made a PR to add a user option to display the effective speed of the player as a multiplier instead of as the straight numeric score. It's over here. Any feedback is welcome.

Code:

Show effective speed as multiplier '[effective_speed]'
Instead of showing absolute speed modifier (e.g. 'Slow (-2)' or
'Fast (+38)'), show the effective rate at which the character is
moving (e.g. 'Slow (x0.8)' or 'Fast (x4.1)').

On the character sheet, I made it show both versions of speed, with the one you've chosen as usual, and the alternative form in parenthesis. See the character dump here for an example of how that looks.

The nice thing about the multiplier is it will teach new players (A) what the speed number means and (B) that speed increases are subject to diminishing returns after a point. It's extremely intuitive.